If , then…

MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

If (tan⁡−1x)2+(cot⁡−1x)2=5π28(\tan^{-1}x)^2+(\cot^{-1}x)^2=\frac{5\pi^2}{8}, then xx equals: (a) −1-1 (b) 11 (c) 00 (d) None of these

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